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I had that on my tires also. It is the UV protection in the tire coming tot he top of the rubber. Some cleaners and "protectants" make it a lot worse. The more you use, the tougher it becomes to remove it.
I bought tire cleaner and scrubbed the heck out of them. You cannot get real strong stuff or again, it will continue to pull the UV protectant out. I use Chemical Guys. It has been on the tire for almost 2 years now and you can just rinse the dirt off and the tires look like new.
[ame="http://www.amazon.com/Chemical-Guys-TVD_109_16-Sprayable-Dressing/dp/B001TI1F5Q/ref=sr_1_4?ie=UTF8&qid=1415146488&sr=8-4&keywords=chemical+guys+tire"]Amazon.com: Chemical Guys TVD_109_16 - Silk Shine Sprayable Dressing (16 oz): Automotive@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41RyAsm2fqL.@@AMEPARAM@@41RyAsm2fqL[/ame]
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